Safety-stop apparatus.



Patented July 30, 1918.

2 SHEETS-SHEET l www.

HILlI P. THEADORE.

SAFETY STOP APPARATLWL APPucATloN FILED MAH. uns.

Patented July 30, 1918.

2 SHEETS-'SHEET 2.

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receives its rtatio :traa step! r1 PAULy 'iHEADoRE, oF LANs-iriver,y MICHIGAN.

sArETY-'s'ror APPARATUS;

'Specicatin of Letters Patent. Patenti-Ed J 30,

' Application ineanay-v, 11s. sea1No.233,oe3.

To all Au: hom it may concern Be it known that I, APAUL THnADoRE, a citizen of the United States, residing at Lansing,'in the county o f Ingham and State of Michigan, have invented certain new and useful Improvements in Safety-Stop Appa'l ratus, of whichthe following is a specification.

My invention relates t'o an automatic safety apparatus for use in connection `with drill presses or other more or less similar machines, to stop the same, in case oflaccident. i 1

An important objectof the invention is to provide apparatus ofthe above mentioned character, which is quick and reliable in op.- eration.

A" further object ofthe invention isto provide apparatus of the above mentioned character, which is simple in construction, cheap to manufacture, strong and durable.

Other objects and advantages ofthe invention will be apparent duringthe course of the following description. Y Y

In-the accompanying drawings forminga part of this specification and `in which like numerals are employed to designate like parts throughout the saine,-

Figure 1 is a side ele ation vof apparatus embodying my invention, showing the same holdinggthe belt np'onth'e tight pulley; n

Fig; 2 is a similar'viewfwith the appaia tus4 shifted-tomovethe belt upon the loose pulley, p n Y y Fig?)y is ahorizontal sectional view taken on line v3 3,of-rfig. 1,. Fig. 4 is asimilar view taken .on line 4-4 of Fig. 1, and, l

Fig. 5 is a similar view taken on line 5*5 of Fig. 1. y

`In the drawings,wherein for the purpose of illustration is shown a preferredenibodi-- ment 0f iny'invention, the numeral 1 0 designates a drill press as awhole, embodyinga base -11 and vertical standard 12, rigidly securedthereto. :Formed uponthe upper end ofthe standard 12 is a head 1 3, having vertical bearings; 14. rIh'e verticaIbeariiigs receivea vertical spindle 1 5l carrying a bit 16, or other tool-.. rI h'e vertical spindle 15 receives its rotation froma horizontal bevel gear 17, driven by atei-tical bevel gearplS, rigidlysecured to lahoriz'ontal shaft 19. The shaft 19 is journaledthrough horizontal bearings 20 'and 21, freghi-iw Thejshaft' 19 pulley 22,V rigidly secured tliereto,andv engaged by av belt 23, extending downwardlytoengage a stepped pulley 24, rigidly secured. upona lower horizontal shaft 25. This shaftfis journaled through stationary. 26. The shaft 25 is equipped with a tight pulley 27 Vrigidly secured thereto and a loos'epulley I 28,- arranged adjacent the sameA andfree to rotate lupon, theshaft 25.- A lshiftable belt 2 9 is adapted to be moved from either pulley 27 and 28-to theother, and thisfbelt engages at its upper po'rtioniwith4 a drivingllpulley, not-shown.`

My improved safety device. comprises a belt shifter, A embodying a horizontal recip rocatory rod 30, mounted withiii a stationary the rod 30 carries a pair'of shifting tinesf3`2, contacting with theopposite edges. of the belt 29, as shown. The forward end of the guide or bearing 31, as shown., One'endpf rod 30 carries a bolt. 33, operatingwithin an elongated slot 34, formedinrthe npper end of a vertically swinging, lever 35,'pivot'ed at its lowerend as shown 313,36., A treadly 37` is k Secured tov-the upper end of. the lever. 35. Therod 3.0. is automaticallymoved Vfor- Waauyer to the right ai Figs. aan@ 2, @y

means of acoinpressible coil spring 38,.one end of which'V engages theA stationary guide 3 1 and the oppositeendof whichengagesa sleeve 39, rigidly secured to. the `rod 430, YThe numerals 40;V and' 41 designate brackets',

which are rigidlyfseclred. tothestalidrd 12, by means of bolts 42. "Theserbracketsiaife providedat their outer ends lwith.apertured heads or bearings. 43, vrotatably receiying therein a` vertical,v shaft 44.,`

at as 19W@ na-ihaarucai esta fi/ rias a crank 45 rigidly secured thereto, whichl is provided at its .free end with af dog146,

adapted to engage upon: the forwardl sideof the lever35,jand'preventsuchlever moving forwardly. The dog 46 hasa p beveledy face 47, adapted forsliding contact .with the lever 3 At its upper end, the'shaft 44has abracket 48rigidly secured thereto, said bracket comprising arms 49 and 50. The arm 49 is pro-` vided. with a screw-threaded,opening-51, receiving an adjustable stop screw 52,u carryinga lock nut 53, as shown. The stop screw,

52 is larranged to :Contact Vwith,theweb of.

the bracket 40. The arm 50 isfpifoyided with acupfshaped head54, receiving therein one end of. eompressible goil spring 55', theopittl sind c" which tlisposed'jvthinl lio recess 56, formed in the web of the bracket 40. It is thus apparent that the spring 55 and associated elements serve to retain the bracket 48 in the normal position, and this bracket retains the shaft 44 in a normal position. When the lever 35 is forced rear,- wardly in contact with the inclined face 47, the spring 55 will yield, thereby allowing the crank 45 to swing inwardly sufficiently, so that the lever 35 may become locked behind the dog 46, and be held thereby against forward movement, until the shaft 44 is turned in the proper direction.

The numeral 57 designates a horizontal rod or crank arranged near and spaced from the upper end of the vertical shaft 44. This rod or crank has one end thereof extended into an opening 58 in a coupling` 59, and clamped therein by means of a screw 60. The coupling 59 is provided with an opennig 61, receiving the vertical shaft 44. A screw 62 serves to clamp this coupling to the vertical shaft. A manually operated element, preferably in the form of a vertical plate 63, provided upon one side with a socket 64, receiving the opposite end of the rod or crank 57, extends transversely of the rod 57. A. screw 65 is carried by the socket 64 and serves to clamp the saine to the rod 57. The plate 63 is arranged in any convenient position, whereby it may be struck or moyed by the operator, in case of accident, to swing the same inwardly, thereby turning the vertical shaft 44 counter-clockwise, and effecting-a disengagement between the dog46 and the lever 35. j

Surrounding the vertical 'shaft 44 is a sleeve or tube 66, which is freely pivoted thereon. The lower end of this sleeve contacts with the lower bearing 43, while its upper end contacts with the socket 59, whereby the vertical shaft 44 is held against downward displacement. y i t its lower end, the sleeve 66 has a horizontal crank 67 rigidly secured thereto, such crank having pivotal connection at its free end with a link 68, as shown at 69. The free end of the link 68 is bent into the form of aneye or loop 70, surrounding the rod'30, and slidably engaging the same. TheY eye or loop 70 contacts with the sleeve 39.

`Rigidly connected with the upper end of the sleeve 66 is a hand crank 71, by means of which the sleeve 66 may be turned upon the vertical shaft 44. Y

The operation of the apparatus is as follows: Y

To start the drill press in operation, the crank 71 is turned rearwardly or away from the spindle 15, and this swinging movement -of the crank turns the sleeve 66 clockwise.

This movement of the sleeve swings the crank 67 rearwardly, which in turn moves the link 68 rearwardly. This'link shifts the reciprocatory rod 30 rearwardly, thereby7 placing the spring 38 under compression. Upon the rearward movement of the rod 30, the lever 35 is swung rearwardly and engages behind the dog 46, which locks the rod 30 against forward movement. Upon this rearward movement of the rod 30, as above indicated, the tines 32 shift the belt 29 upon the tight pulley 27, and the drill press is set into action. In case of accident, the operator strikes the plate 63, swinging the same inwardly. This turns the shaft 44 upon its longitudinal axis in a counter-clockwise direction, and the crank 45 is swung inwardly whereby the dog 46 will release the lever 35. The spring 38 will now quickly shift the rod 30 to the right thereby causing the belt 29 to be transferred to the loose pulley 9.8. The power will be thus cut of from the drill press which will stop when its inertia is overcome.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement 0f parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. Apparatus of the character described,

comprising a reciprocatory rod, power shifting mechanism connected with the rod to be moved thereby, a spring adapted to move the rod in one direction, a lever connected with the rod, a shaft arranged near the lever, a dog connected with the shaft to be shifted thereby and adapted to engage with the lever for holding it against movement in one direction, a manually operated device connected with the shaft to turn it in one direction, a sleeve pivoted upon the shaft, a manually operated device to turn the sleeve in one direction, and means arranged between the sleeve and reciprocatory rod whereby the sleeve may move the rod in opposition to the spring.

2. Apparatus of the character described, comprising a reciprocatory rod, power shifting mechanism connected with the rod to be moved thereby,a spring adapted to move the rod in one direction, a lever pivoted with the reciprocatory rod to move with it, a shaft arranged near the lever, a dog connected with the shaft to be shifted thereby and adapted to engage the lever for holding' it against movement in one direction, a manually operated device connected with the shaft to turn it in one direction, a sleeve 3. Apparatus of the character described, comprising a reciprocatory rod, power shifting mechanism connected with the rod to be moved thereby, a spring to move the rod in one direction, a lever pivoted with the reciprocatory rod to move With it, a shaft arranged near the lever, a dog connected with the shaft to be shifted thereby and adapted to engage with the lever for holding it against movement in one direction and having a beveled face, yielding means to retain the shaft in the normal position, a manually operated device to turn the shaft in one direction, a sleeve pivoted upon the shaft, a manually operated device to turn the sleeve in one direction, and connecting means between the shaft and the rod.

4. Apparatus of the character described, comprising a movable rod, a stationary guide for the rod, a sleeve clamped to the rod, a spring surrounding the rod and confined between the stationary guide and sleeve and adapted to shift the rod in one direction, power shifting mechanism conneeted with the rod to be moved thereby, lock means to hold the rod against movement in one direction, manually operated means to release the lock means so that the rod is free to move, a manually operated crank, and a link pivoted to the crank and having an eye formed thereon'slidably receiving the rod and arranged to contact with the sleeve. Y

5. Apparatus of the character described, comprising a movable rod, a spring to shift the rod in one direction, power shifting means connected with the rod, a lock device to hold the rod against movement in one direction, manually operated means to actuate the lock device to release the rod, and separate means to reset the rod.

6. Apparatus of the character described, comprising power shifting spring means adapted to move the power shifting mechanism in one direction, a lock device adapted to hold the mechanism against movement inone direction, a shaft connected with the lock device to actuate the same, means to turn the saft, a sleeve pivoted upon the shaft and having connection with the shifting' mechanism to reset the same, and means to turn thesleeve.

In testimony whereof I aix my signature in presence of two witnesses.

PAULV THEADORE.

Witnesses: Y

EDGAR F. BENDER, D. R. LIVINGSTONE.

Copiesvot this patent may be obtained for ve centi each, by addressing the Commissioner of Patents,

Wuhing'ton, D. C.

mechanism, v 

